KR101736184B1 - Method and apparatus for driving boost converter for injector - Google Patents

Method and apparatus for driving boost converter for injector Download PDF

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Publication number
KR101736184B1
KR101736184B1 KR1020150153666A KR20150153666A KR101736184B1 KR 101736184 B1 KR101736184 B1 KR 101736184B1 KR 1020150153666 A KR1020150153666 A KR 1020150153666A KR 20150153666 A KR20150153666 A KR 20150153666A KR 101736184 B1 KR101736184 B1 KR 101736184B1
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South Korea
Prior art keywords
voltage
boost
boost voltage
frequency
boost converter
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KR1020150153666A
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Korean (ko)
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KR20170051936A (en
Inventor
이시광
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현대오트론 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
    • H02M2003/1552—

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The present invention relates to a method and an apparatus for driving a boost converter for an injector, in which when a boost converter having a target boost voltage, an initial switch frequency, and a standby time is driven, the control unit senses a boost voltage Changing the switch frequency higher than the initial switch frequency when the sensed boost voltage reaches the predetermined target boost voltage, and changing the switch frequency to a higher frequency than the initially set switch frequency, Thereafter, the control unit starts the injection by driving the boost converter at the changed frequency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boost converter for an injector,

The present invention relates to a method and apparatus for driving a boost converter for an injector, and more particularly, to a method and apparatus for driving a boost converter for an injector, And more particularly, to a driving method and apparatus for a boost converter for an injector in which a large power can be used without generating an overcurrent by varying a switching frequency.

Generally, engines such as diesel engines and gasoline engines use injectors to control the injection of fuel.

At this time, a solenoid coil is used for the injector, and the injection of the fuel is controlled by using the current flowing through the solenoid coil. However, when the injection command is issued, it is necessary to instantaneously apply a high voltage in order to drive the injector and inject fuel within a short time.

For this purpose, especially in the case of a common rail diesel engine, the injector driver is required to have a boost converter that applies a high voltage to the injector when the injection command is issued.

The input voltage is connected to both ends of an inductor (not shown) to charge the current while the switch (not shown) is grounded while the input and output terminals are grounded. When the switch is turned off, The current source system is configured to transfer the current to the load. When the load is viewed from the standpoint of the load, the current flows periodically and then is repeated.

Meanwhile, the boost converter may be designed in a continuous current mode (CCM) in which a continuous current flows through an inductor or in a discontinuous current mode (DCM) in which a current flowing through the inductor is partially cut off .

However, when the boost converter is designed as a DCM, there is a problem in that it is impossible to detect whether the boost voltage has reached the target voltage (i.e., the initial state). In addition, in order to obtain a large power, , Switching frequency) is increased, there is a problem that an overcurrent may be generated in the converter by operating in a continuous current mode (CCM) during the initial driving. On the other hand, in order to avoid the CCM during the initial driving, ), There is a problem that high power can not be used in normal operation.

The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-0927649 (published on November 12, 2009, DC voltage converter).

According to an aspect of the present invention, there is provided a fuel cell system including a fuel cell for generating a boost voltage for driving an injector to detect whether a target voltage has been reached within a target time, And an object of the present invention is to provide a method and apparatus for driving a boost converter for an injector that can vary the switching frequency of a boost converter to use a large power without generating an overcurrent.

A method of driving a boost converter for an injector according to an aspect of the present invention includes the steps of detecting a boost voltage after a waiting time of a boost converter when a boost converter having a target boost voltage, an initial switch frequency, ; Changing the switch frequency higher than the initial switch frequency when the sensed boost voltage reaches the predetermined target boost voltage; And changing the switch frequency to a higher frequency than the initially set switch frequency, the control unit starts the injection by driving the boost converter at the changed frequency.

The method may further include stopping the injection when the sensed boost voltage is lower than the predetermined boost voltage after the wait time has elapsed .

According to another aspect of the present invention, the controller may further include a step of displaying the sensed boost voltage through a display unit after the step of sensing the boost voltage after the waiting time has elapsed.

According to another aspect of the present invention, there is provided an apparatus for driving a boost converter for an injector including: a voltage sensing unit for sensing a boost voltage generated in a boost converter for an injector; A timer for checking a time at which the boost voltage reaches a target voltage; A switching frequency adjustment unit for adjusting a switch frequency of the boost converter for the injector; And checking whether the boost voltage sensed by the voltage sensing unit reaches a target voltage, checking whether the boost voltage starts to be generated through the timer unit and reaches a target voltage, And a controller for adjusting the switch frequency through the switching frequency adjusting unit based on a time when the voltage reaches the predetermined voltage.

In the present invention, when the boost converter having the target boost voltage, the initial switch frequency, and the standby time is driven, the controller senses the boost voltage after the waiting time elapses, When the set target boost voltage is reached, the switch frequency is changed to be higher than the initial switch frequency, and then the boost converter is driven at the changed frequency to start the injection.

In the present invention, the controller may stop the injection if the sensed boost voltage is less than the preset boost voltage.

The present invention further includes a display unit for displaying the sensed boost voltage.

According to an aspect of the present invention, there is provided a method of controlling a boost converter, comprising: sensing whether a target voltage has been reached within a target time when generating a boost voltage for driving an injector, displaying a result of the detection, So that you can use a lot of power.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a schematic configuration of a boost converter drive device for an injector according to an embodiment of the present invention; FIG.
2 is a flowchart illustrating a method of driving a boost converter for an injector according to an embodiment of the present invention.
3 is an exemplary diagram for explaining a method for performing a switch frequency change of a boost converter according to whether the boost voltage reaches a target voltage within a predetermined time in Fig.

Hereinafter, a method and apparatus for driving a boost converter for an injector according to the present invention will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is an exemplary diagram showing a schematic configuration of an apparatus for driving a boost converter for an injector according to an embodiment of the present invention. Referring to FIG.

1, the boost converter drive device for injectors according to the present embodiment includes a voltage sensing unit 110, a timer unit 120, a control unit 130, a display unit 140, and a switching frequency adjustment unit 150 ).

The voltage sensing unit 110 senses whether the boost voltage reaches the target voltage when the boost voltage is generated in the boost converter for the injector.

When the boost voltage is generated in the boost converter for the injector, the timer 120 checks whether the time from the start of the boost voltage to the target voltage is reached within the target time (i.e., the target set time).

The display unit 140 displays a result of detecting whether the boost voltage reaches a target voltage. Also, the display unit 140 displays a result of checking whether the time from the start of the boost voltage to the target voltage within the target time (i.e., the target set time) is reached.

The switching frequency adjuster 150 adjusts the switch frequency (i.e., the switching frequency) of the boost converter for the injector.

The controller 130 controls the functions of the components 110, 120, 140 and 150 as a whole.

For example, the controller 130 checks whether the boost voltage reaches a target voltage through the voltage sensing unit 110. Also, the controller 130 checks the time at which the boost voltage starts to be generated and reaches the target voltage through the timer unit 120. Also, the controller 130 displays the sensed boost voltage and the time at which the boost voltage reaches the target voltage through the display unit 140. Further, the controller 130 adjusts the switch frequency (i.e., the switching frequency) through the switching frequency adjuster 150 based on the time at which the boost voltage and the boost voltage reach the target voltage.

In other words, the controller 130 determines that the boost voltage sensed after a predetermined waiting time (e.g., 100 ms) (i.e., the set time) has elapsed is smaller than the predetermined boost The controller 130 sets the switch frequency (i.e., switching frequency) (e.g., 500 kHz) through the switching frequency adjuster 150 to the initial set switch frequency (i.e., , Switching frequency) (eg 100kHz) (eg 500kHz).

Although not shown in the figure, the controller 130 may display the sensed result (i.e., the boost voltage sensed after the set time) through the display unit 140. FIG.

After the switch frequency (i.e., switching frequency) (e.g., 500 kHz) is changed to a frequency higher than the initially set switch frequency (e.g., switching frequency) (e.g., 100 kHz), the control unit 130 Start the boost converter by starting the boost converter. That is, at the initial stage of driving the boost converter, the switch frequency (that is, the switching frequency) is set low to avoid the continuous current mode (CCM), and after the set time has elapsed, , Switching frequency), so that high power can be obtained.

3 (b), the boost voltage sensed after the preset waiting time (e.g., 100 ms) (i.e., the set time) has elapsed is compared with the preset boost voltage (e.g., 65V) That is, the target voltage), the control unit 130 stops the injection.

Hereinafter, a driving method of the boost converter for the injector according to the present embodiment will be described in more detail with reference to the flowchart of FIG.

2 is a flowchart illustrating a method of driving a boost converter for an injector according to an embodiment of the present invention.

As shown in FIG. 2, a target boost voltage (for example, 65 V) and an initial switch frequency (i.e., initial switching frequency) (for example, 100 kHz) for driving the boost converter (not shown) are set (S101).

Note that the target boost voltage (e.g., 65V) and the initial switch frequency (i.e., the initial switching frequency) (e.g., 100kHz) are values set by one example, and may be set to other values in other embodiments.

After the target boost voltage and the initial switch frequency (i.e., the initial switching frequency) for driving the boost converter are set as described above, a wait time (e.g., 100 ms) is set (S102).

Note that the waiting time (e.g., 100 ms) is a value set by one example, and may be set to another value in another embodiment.

When the boost converter is driven in a state where the target boost voltage, the initial switch frequency (i.e., the initial switching frequency) and the standby time for driving the boost converter are set as described above, the controller 130 controls the standby time (e.g., (I.e., the set time) (S103).

When the predetermined waiting time (e.g., 100 ms) (i.e., the set time) elapses after the boost converter is driven, the controller 130 monitors the boost voltage (S104).

That is, after the predetermined waiting time (for example, 100 ms) (i.e., the set time) has elapsed, the controller 130 senses the boost voltage and the boost voltage is lower than the preset boost voltage (See FIG. 3A), the controller 130 sets the internal status register to 1 (S105).

When the status register is set to 1 as described above, the controller 130 changes the switch frequency (i.e., switching frequency) (e.g., 500 kHz) through the switching frequency adjuster 150 (S106).

The switching frequency (for example, switching frequency) (for example, 500 kHz) is higher than the initially set initial switching frequency (i.e., the initial switching frequency) (e.g., 100 kHz).

After switching the switch frequency (i.e., switching frequency) (e.g., 500 kHz) to a higher frequency (e.g., 500 kHz) than the initially set initial switch frequency (i.e., the initial switching frequency) (e.g., 100 kHz) The controller 130 starts the injection by driving the boost converter at the changed frequency (S107).

That is, at the initial stage of driving the boost converter, the switch frequency (that is, the switching frequency) is set low to avoid the continuous current mode (CCM), and after the set time has elapsed, , Switching frequency), so that high power can be obtained.

However, after the preset waiting time (e.g., 100 ms) (i.e., the set time) has elapsed, the boost voltage sensed by the controller 130 is set to the predetermined boost voltage (e.g., 65V) 3B), the controller 130 sets the internal status register to 0 (S108). If the target voltage is less than the target voltage (see FIG.

If the status register is set to 0 as described above, the controller 130 stops the injection (S109).

At this time, although not shown in the figure, an alarm (warning) may be output when the sensed boost voltage is lower than the target voltage.

As described above, according to the present embodiment, the initial diagnosis of the high voltage required by the injector is performed during the initial operation of the boost converter to prevent the malfunction of the injector, and the injector boost converter can be stably driven to provide a large power .

3 is an exemplary diagram for explaining a method of performing a switch frequency change of the boost converter according to whether or not the boost voltage reaches a target voltage within a predetermined time in FIG.

3 (a) shows a case where the sensed boost voltage becomes the predetermined boost voltage (e.g., 65V) (i.e., the target voltage) after a preset waiting time (e.g., 100 ms) And Fig.

FIG. 3B shows a state where the sensed boost voltage is smaller than the predetermined boost voltage (for example, 65V) (that is, the target voltage) after a predetermined waiting time (for example, 100 ms) And Fig.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, I will understand the point. Accordingly, the technical scope of the present invention should be defined by the following claims.

110:
120:
130:
140:
150: Switching frequency adjustment section

Claims (7)

When the boost converter having the target boost voltage, the initial switch frequency, and the standby time is driven, the control unit senses the boost voltage after the waiting time has elapsed;
Changing the switch frequency higher than the initial switch frequency when the sensed boost voltage reaches the predetermined target boost voltage; And
The method of driving a boost converter for an injector according to any one of the preceding claims, wherein the control unit changes the switch frequency to a frequency higher than an initially set switch frequency and then starts the injection by driving the boost converter at the changed frequency .
The method according to claim 1,
After sensing the boost voltage after the waiting time has elapsed,
Wherein,
And stopping the injection if the sensed boost voltage is less than the predetermined target boost voltage. ≪ Desc / Clms Page number 19 >
The method according to claim 1,
After sensing the boost voltage after the waiting time has elapsed,
Wherein,
And displaying the sensed boost voltage through a display unit. The boost converter according to claim 1, further comprising:
A voltage sensing unit for sensing a boost voltage generated in the boost converter for the injector;
A timer for checking a time at which the boost voltage reaches a target voltage;
A switching frequency adjustment unit for adjusting a switch frequency of the boost converter for the injector; And
The controller checks whether the boost voltage sensed by the voltage sensing unit reaches a target voltage, checks whether the boost voltage starts to be generated through the timer and reaches a target voltage, And a controller for adjusting the switch frequency through the switching frequency adjusting unit based on a time required for the boost converter to reach the predetermined voltage.
5. The apparatus of claim 4,
When the boost converter having the target boost voltage, the initial switch frequency, and the standby time set is driven, the boost voltage is sensed after the waiting time has elapsed,
Wherein when the sensed boost voltage reaches the preset target boost voltage, the boost converter starts the injection by driving the boost converter at the changed frequency after changing the switch frequency higher than the initial switch frequency. drive.
6. The apparatus of claim 5,
And stops the injection when the sensed boost voltage is lower than the preset target boost voltage.
5. The method of claim 4,
And a display unit for displaying the sensed boost voltage.
KR1020150153666A 2015-11-03 2015-11-03 Method and apparatus for driving boost converter for injector KR101736184B1 (en)

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KR1020150153666A KR101736184B1 (en) 2015-11-03 2015-11-03 Method and apparatus for driving boost converter for injector

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Application Number Priority Date Filing Date Title
KR1020150153666A KR101736184B1 (en) 2015-11-03 2015-11-03 Method and apparatus for driving boost converter for injector

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KR101736184B1 true KR101736184B1 (en) 2017-05-16

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005259764A (en) 2004-03-09 2005-09-22 Denso Corp Electromagnetic actuator drive unit
JP2006336568A (en) 2005-06-03 2006-12-14 Denso Corp Injector driving device
JP2010252512A (en) 2009-04-15 2010-11-04 Denso Corp Control unit and control system of dc-dc converter
JP2015002579A (en) 2013-06-13 2015-01-05 Tdk株式会社 Dc-dc converter and power supply device including dc-dc converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005259764A (en) 2004-03-09 2005-09-22 Denso Corp Electromagnetic actuator drive unit
JP2006336568A (en) 2005-06-03 2006-12-14 Denso Corp Injector driving device
JP2010252512A (en) 2009-04-15 2010-11-04 Denso Corp Control unit and control system of dc-dc converter
JP2015002579A (en) 2013-06-13 2015-01-05 Tdk株式会社 Dc-dc converter and power supply device including dc-dc converter

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